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2 Sheets-Sheet 1.

J. D. OOTTRELL.

LET-OFF MECHANISM FOR LOOMS.

No. 312,708. Patented FebfZ l, 1885.

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.2 SheetsSheet 2.

(No Model.)

J; D'. GOTTRELL. LET-OFF MECHANISM FORILOOMS.

No. 312,708. Patented Feb. 24,1885.

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N. PETERS. PhoEoLithngnphfir. Walhington, D C.

NIIE STATES PATENT trace.

LET-OFFMECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 312,708, dated February 24, 1885. Application filed January 30, 188-1. (No model.)

To all whom it nmy concern.-

I Be it known that I, J ESSE D. GorrRELL, of Central Falls, in the county of Providence and State of Rhode Island, have invented an Improvement in Let-Off Mechanism for Looms, of which the following is a specification.

My invention consists of the combination, with the whip-roll, of a supplemental support adapted to sustain the whip-roll against the strain caused by the increased tension of the warp-threads at the time of the beat up of the lay, thus allowing the whip-roll and its connections to be made lighter than heretofore.

Figure 1 represents a partial end elevationand section of a loom provided with my improvement. Fig. 2 is a plan view of the whiproll and myimproved whip-roll support. Fig. 3 is a detail section of a portion, the same taken in a horizontal plane; and Fig. 4, a similar section taken in a vertical plane. Figs.5 and 6 are transverse sections taken in the line :10 m of Fig. 2, and show the relative position of the whip-roll and its support at the backward and the forward stroke of the lay. Fig. 7 is a partial end view and section of the loom,showing the warp-beam and the let off mechanism. Fig. 8 is a detail view showing the gear-connection between the warp-beam and the spurwheel of the escapement. Figs. 9 and 10 are detail views of the-escapement of the let-off mechanism, Fig. 10 showing a section of .the reciprocating pallet-bar, taken in the line 00 or of Fig. 9, which shows a face view of the escapenient-wheel with the reciprocating bar broken away in the line y 3 of Fig. 10 in order to show the construction of the pallet.

In the accompanying drawings,' A is the frame of the loom; B, thelay, andOthecrankshaft, from which operative connection is made to the lay Bby means of connecting-rods C.

In Fig. 1, D represents any suitable known let-off, to which connection may be made from the end of the pivot-shaft E of the whip-roll by means of the arm F, or otherwise.

The whip-roll support may be varied in its construction; but I prefer to make it in the form of a recessed bar, G, provided with the hollow journals H H,through which are passed the pivot-j ournals E E of the whip-roll I. The end arms, aa, of the whip-roll are held in the enlarged end portions of the recess 2), made in the upper side of the supporting-bar G, and to the bar G is rigidly secured the pendent arm J, from the lower end of which connection is made to the sword (I of the lay B by means of the connecting-rod K, and by this means the supporting-bar G and the lay B will be caused to vibrate in unison with each other; but it is to be understood that the vibration ofthe whi proll support may be otherwise'secured, as by means of a cam, 1 located on the crank-shaft O, as shown in Fig. 7, and the movement of the support will not in this case fully coincide with the movement of the lay. The hollow journals H H of the supporting-bar G are held in the journal-bearing stands L L, made open in a vertical direction for the ready removal of the bar G and whip-roll, and upon the outer end of the pivot-shaft E, Fig. 2, and outside of the j ournal-bearing stand L is placed the sleeve M, provided with a flange, e, as shown in Fig. 4c, and the sleeve M is prevented from rotation upon the shaft E by means of the pin 70, secured to one side of the journal-bearing stand L, and entering a suitable holemade in the flange e of the sleeve. One end of the torsionspring N,

which 1s placed over the cylindrical portion of e of the sleeve, and the opposite end of the spring is secured to the collar 0, which is firmly held upon the end of the pivot-shaft E by means of the set-screw c, and the adjustable resilience of the spring N will serve to properly regulate the action of the whip roll I upon the warp-threads.

At the forward beat of the layB the inner edgeyi, ofthe supporting-barG willbebrought to rest under and support the whip-roll against the strain of the warp-threads j, as shown in Fig. 6, and at the backward stroke of the lay B the whip-roll will be released from the action of the supporting-bar and be free to act upon the let-off D, as required by theincreased tention of the warp-threads after each successive beat of the reed against the weft.

The rear edge, at, of the supporting-bar G serves to shield the journals of the whip-roll I from the tension strain of the warp-threads as they run from the beam; and by reason of the above-describedimprovement the whiproll 0t looms may be made very much lighter' than heretofore, thus rendering the let-off mechanism more sensitive in its action, which is a great desideratum when weaving fine and the sleeve M, is secured to the flange light goods, and is also advantageous in weaving heavy goods with the required degree of uniformity. I

I do not of courselimit my claim for supporting the whip-roll against the strain of the warp-threads to the bar G shown in the drawings, as it is evident that other devices may be employed to support the whip-roll when under the maximum tension of the warpthreads at the beat, and by a retrograde movement release the whip-roll in order to provide for the proper free and sensitive action of the let-off mechanism, which is the gist of my improvement.

The construction and attachment of a let-oft" mechanism, D, Fig. 1, are more fully shown in Figs. 7, 8, and 9, in which the gear-wheel A, secured to the warp-beam, is made to mesh with the pinion A placed upon the inner end of the shaft D, which passes through bearings in the frame. The outer end of the shaft D carries a gearwheel, B, which meshes with a pinion, E, Fig. 8, secured to the wheel F, which revolves freely upon a short stud, b, secured to the frame of the loom. The wheel F is provided on its outer side with a series of equidistant pins or studs, 0 c c 0, adapted to arrest the motion of the wheel when coming in contact with a pallet and pawl secured to a bar, G, which is supported diametrically across the face of the wheel F in suitable slide-bearings. The bar G is provided at one end with the slot adapted to receive the outer end of the stud b, and the opposite end of the bar Gisheld in the slide-bearing H. To the upper side of the bar G is secured the pallet I, and to the side of the bar G, at a point, d, eccentric with the wheel F, is pivoted the pawl J, from which connection is made to the arm F of the whip rollshaft E by means of the slotted link M. The arm N, held loosely upon a fixed stud, e, and thrown forward by the action of the weight 0, bears at its upper end against the back of the pawl J, tending to force the pawl to its bearing-point upon the upper side of the bar G, as shown in Fig. 1, and also to force the bar G to its extreme forward position, which point is determined by the slot and stud b. The bar G is thus arranged for a limited forward and backward movement near the face of the wheel F, the pallet I serving to support the stud c, and thus to prevent the revolution of the wheel F, while the pawl rises from its bearing-point over the opening h at the side of the bar G to contact with the studs 0 c 0 when the bar G is made to move in one direction, and to release the spur c and allow the wheel F to turn for the full limit of the vertical movement ofthe pawl J from its bearing-point upon the bar G whenever the bar G is caused to move in the opposite direction.

The escapement let-off mechanism above de scribed was shown in my Letters Patent No. 308,953, December 9, 1884, the application for which was filed May 29, 1882, and Patent No. 296,927, dated April 15, 1884, the application forwhich was filed January 17 1884. I therefore make no claim to such mechanism in the present application.

I claim as my invention- 1. The combination of a whip-roll with a vibrating support adapted to support the whiproll against the increased tension of the warpthreads at the forward beat of the lay, and means for vibrating the whip-roll support, substantially as described.

2. The combination of a loom let-off mechanism with a vibrating support adapted to support the whip-roll against theincreased tension of the warp-threads at the forward beat of the lay, and means for vibrating the whip-roll support, substantially as described.

3. The combination of the whip-roll I with the recessed bar G, provided with the protecting-edge m and the supporting-edge t, and means for vibrating the bar G, substantially as described.

JESSE D. COTTRELL.

Witnesses:

SOORATES SOI-IOLFIELD, HARMON S. BABCOCK. 

